Improvement in drop-hammers



.UNITE-D STA-Tas PATENTA OFFICE.

. JOHN EvANs, on Nnw HAVEN, OONNEO*rieur-` IMPROVEMENT IN DROP-HAMMi-ias, i.

speciucatiou' arming part or Leiters Patent No. 47,405, time' .iprn e5, isos;-

l To all whom it may concern:

Beit known that I, JOHN EVANS, ofl the. city and county of New Haven, in the State of Connecticut, have invented a new and useful Improvement in Drop-Ham mers; and I do hereby declare that the following is a full,

clear, and exact description of the construction, character, and operation of the same,'ret` erence being had to the accompanying draw-V posed of two parts, (and their appendages,) the lower part 'being hollow tov receive the lower` end of the solid or upper part, aud-with vthe' lower extremity tted to hold an india-rubber cushion, under which a belt presses, and in 'having the upper part solid, and its lupper extremity fitted to hold an `india-rubber cushion,

over which a belt presses, and (nerth'e upl per.l end) having thissolid part pass freely through a projection or crank-pin, adjustably ttedeccentrically to the face of a wheel which revolves to work the hammer, against which projection the belt is, when vertically adjusted, secured by `washers and binding-screws, so that the belt will regulate the extent'of the vertical motion of the rod, through the crankpin, and in using a spiral or any other suitable spring on this rod between a collar or stop on thesolid part andthe top of the hollow part, to force the hammer downward, and yetto allow it to rise by its own momentum when worked rapidly, by means'of the necessary appendages, as hereinafter described.

I make the frame A A of cast-iron or any other suitable material, substantially of the formlandproportions shown in Fig. 1, and in part in section in Fig. 2 which I can cast'in one piece, to avoid the liability to get out of order by a'screw getting loose. In the upper surface of the lower part or bed of this frame l' have a suitable groove or space, into which Isinsertjthe lower die, b, Fig. `2 which Imake .l of a shape or `form to suitl the'work being forged. Y y l. l I make the hammer ot' east-iron or any other suitable material, of a eubicform, as shown at B, Fig. l, (or of any other convenient shape,)

with a hollow or space in the` upperportion r extending below its center, and of suicient size to receive the connecting-rod and `to allow itto work freely, as "shown at- B, Fig. l,

and in'section in Fig. 2, and in the lowersurface of this hammer I make, a suitable groove or space, in which Iinsert-a steel die, as a, Fig. 2, of ashape or form of face suited to the work intended to be forged.

I make the connectingrod,-Fig. 3,.of `the several parts shown inthe drawings-that is,

Imake the lower part with a socket or tube to receivethe upper part, als,` shown at e, Figs.

' 1, 2, and-, with its lower extremity properly shapedfna semitubular form) to receive andhold a piece of india-rubber tubing, as shown at d, Fig. 3, and indicated` at` d,I`ig.V

2, in' section;

I make the upper part ot a solid iron rod, as `1u shown' at c, Figs. 1, 2, and 3,`with `the upper extremity tted to hold an india-rubber cushion,

as shown at f, Figs. 1, 2, and 3, and acollar or stop, as shown 'at g, Fig. 2, against whigi'the end of aspiral or any other suitable spring, h,

is to rest. j About this connectingrod, after puttingon th'e spring h and inserting the lower end of the solid parte into the hollowr 4part c, Itit a leather (or any other suitable) belt C, which will pass under the lower cushion, d, and over the upper cushion, f, and secure it in itslvpflace by binding it round nea-r the top and bottom, as shown in Fig. 3, orby any other'convenient means,so that the strain i on the belt, from either way,will act first upon the cushions, which, with the elasticity'or yielding ofthe belt, will entirely prevent jarring. l l

` I make the adjustable projection or crank pin D with apivot, i, to revolve in a plate and block, l, Figs. 2 and 3, which block passes or drops into a slot in the wheel E, and the plate is secured to the wheel by binding screws working in slots foradustment, as shown at k k, Figs. 1 and 8. Through the central part of this crank'piuDyI drill a hole vertically, through which the upper por tion of the solid rod e passes freely for the 3, or in lany analogous Way.

bo'th' parts of the frame from front to rear, asl

l `I cut a longitudinal slot, in which I place a' eluteh-pin, n, and a spiral spring, o, lo force cram-pin, (notr'seeln) and the 'outer end 'is clutch-pin to b an eccentric, r 1^, lsevurtul by a pin, s, to the y p'ess the brake L against itsperiphery pu'rpose of adjusting the portions of the belt U above and below the crank-pin, Where the belt., when adjusted, is secured by Washers and binding-screws, as shown in Figs. l and I make the crank-pin wheel Eef east-iron or any-other suitable material, With a slot, as shownl at Z, in whichthe 4crankpin is to be adjusted; and I fit this wheel E firmly onto the main shaft on m, which -extends through shown iu section in Fig. 2. `In this shaft m m the clutch-pin n into the clutch-Wheel p, all as shown in Figs 2 and 4. I make'this, clutchpin 'n and'eluteh-wheel p in the ordinary form, as shown in Figs. l and 2, and-I firmly secure the clutchwheel p to the face ofthedriving-pulley F, as shown lin Fig. l, which driving-pnl'- ley F runs freely on the shaft m m when the clutch is not in gear. Under-this shaft m m, and at right angles to it, Ita vibrating bar or lever, G, which vibrates vertically onV a fulheld down While the hammer is working by a treadle, H, and conneetingrod I as shown in Fig. l. On the upper surface of thisbar, under the main shaft, I fit an inclined plane, as shown insection4 at q,.Fig. 2, so that when the bar Gr is thrownfup by thel spiral spring K, Fig. 1, as indicated in Fig. 2, as the clutchpin n revolves the inclined plane q'will force it back against the spiral spring o and out of the teeth of the clutch-wheel p, so that the driving-pulley F will run loose on`the vnnain shaft m m, while the shaft and all thevother Working parts will remain stationary until the treadle EI is again pressed down to allow the e forced out to put the parts in gear.'A A To prevent the Wheel E from being turnedbaekward by the Weightot1 the hammeri or otherwise While/the clutch is out of gear, I tit a shoe or brake, L, Figs. land 2, to work on front portion of the frame, as shownin Fig. 2, orotherwise, so that if itbe attempted to turn the Wheel bbaekward the eccentric r r will a nd rectum indieateaty the, demini@ brake L win be carried upward and the `vvheel E Will be Having made all the parts as before described, I pass .the main shaft through" the frame and the revolving parts, place the spiral spring p and clutch-pin n in their places, and secure the lower end, d, of the connecting rod in the hammer B `by the pin w and the upper end to the Wheel 'E by the plate l and the serews,.all as shown in sectionv in Fig. 2, When- -the Whole will appear' as represented in Fig. l,

and will be ready for use.

The power' maybe' applied.by a belt, M, Worked by a drum venient method.

Theadvantages of my improvement consist invthatwhile the spring 71. will cause thev ham-A amertofstrike with the'ful'lest force, the belt C will always take up' the rebound, so as to entirely prevent jarring; and in that the hanlmer maybe adjusted las to the height it will be raised by means of the belt C, as well asv j by the eccentric position of the 'crank-pin D;

andy in that it may `be' run withV any desired velocity without danger, as there is no part liable to heat so asytodo any/"injury, as in the i easevwhere any packing is'used, as in the atmospherio hammer; and in' that the manner of throwing the clutch into and ontfof gear j l occasions the least possible jat-ringer noise while the'maehine is Working.A Vhat I elaiin asA my invention,- an

1. The combination of the connecting-rod with the hammer, when .they are constructed and attached substantially as herein described.

2. The combination of the connecting-rod` Wi th the crankyuinwhen they are construct-ed, arranged, and fitted for adjustment substantially as herein described and set forth. f

, JOHN EVANS. Witnesses:

CHARLES E. TrIoMrsoN', e It. FITZGERALD.

,as N, orrby any other con` Id desire *f 

